The professor explains his new invention. Maria arrives, and expresses her doubts about his little pills. However, after taking one she is extremely turned on – just like he said! It looks like the professor was right all along, and he is about to get his just reward. Maria goes down on him without hesitation, before mounting him so that she can feel his dick inside her. The mad genius finishes on her tits, and reminiscences about the benefits of his new product.